A man equipped with a hammer had used a ladder to reach the 10ft tall sculpture, which depicts Prospero and Ariel from Shakespeare’s play The Tempest. Police were called to Broadcasting House in Portland Street, Westminster, at around 4.15pm on Wednesday.
The man had caused graffiti damage to the sculpture, as well as damaging it with the hammer.
Technicians from PTSG Building Access Specialists Ltd used the Doff System – approved by Stonehealth Ltd and Heritage (UK) – to remove the graffiti, achieving temperatures of up to 150 degrees at the nozzle end.
Thierry Schoen, Divisional Director of PTSG Building Access Specialists Ltd, said: “Our clients in London and the Greater London region can rely on a vast range of experienced technicians and engineers from PTSG to resolve almost any issues facing commercial and residential properties. Strategically placed in London, our team can be mobilised in no time and all our teams are working across the city and beyond, day in and day out.”